Messaging system for a win32 program is very important, it is the source of power running. A crack, is a 32-bit system-defined, his only defines an event, send a notice to Windows, an application to tell what happened. For example, clicking the mouse, to change the window size, press a key on the keyboard will send a message that the Windows application to generate the application program. Message may be generated by the system or application. The system generates a message in the event of input events. For example, when the user keystrokes, move the mouse or click the control. The system also generates a message in response to changes brought about by the application, such as applications to change the system to change the font size form. The application can generate messages to make the form to perform tasks, or communication with other applications in a window.
Simply put, the message corresponding to the event, one event generates a message, the message itself is the message map and message processing function correspondence.